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hydrodynamic equations

(equations describing the dynamics of fluids)

Hydrodynamic equations are equations that describe fluid dynamics, relating velocity, mass, momentum, and pressure. The Navier-Stokes equations provide a very general framework, which may be made more specific by plugging in the characteristics of the forces, e.g., for fluids on astronomical body such as its atmosphere or liquid bodies, for gravity. For (approximately) spherically-symmetric flows, e.g., the solar wind, it can be the equation of hydrostatic equilibrium with an added term to cover the motion.

(fluid dynamics,hydrodynamics)